Unique approach to selective stimulation of carbonate reservoirs with multiple sets of perforations and comingled production plays dividends ///

In 2004, a selective zonal-isolation stimulation system underwent field trials when it was deployed in existing and underperforming wells. The system today is being used as part of a stimulation program1 in the Norwegian North Sea to evaluate its effectiveness in the chalk formations of a newly drilled well. The zonal isolation straddle packer system is run on Coiled Tubing (CT) to selectively stimulate individual sets of perforations while leaving others isolated.
INTRODUCTION
The wells were typically completed with long horizontal or high-angle sections often in excess of 3,000 ft (914 m) in length with several distinct sets of perforations and as often as ten separate, perforated intervals. To bring the wells into production with economically acceptable flowrate, the operator’s practice was to perform acid fracturing operations on newly completed wells.